First port of DBOutputService to new DB implementation
PoolDBOutputService moved to new DB implementation
IOV and GT schemas changed as SessionImpl attribute
Introduced ConnectionPool
Extended connection API to enable the implementation of multi-threading condition pre-loading
reverted back DBOutputService
Merge branch 'new-conddb-only-newconddb-backend-no-pooldboutputservice' into new-conddb

Conflicts:
	CondCore/CondDB/interface/ORAWrapper.h
	CondCore/CondDB/src/ORAWrapper.cc
cleaned up unused code